How do I add onto the X property of Orientation using a script?

Hello, how would I use the X property of Orientation with a script? Thanks.

local part = script.Parent

local incr = 360/20

-- Rotate the part continually

while true do

for deg = 0, 360, incr do

-- Set only the Y axis rotation

part.Rotation = Vector3.new(0, deg, 0)

-- A better way to do this would be setting CFrame

--part.CFrame = CFrame.new(part.Position) * CFrame.Angles(0, math.rad(deg), 0)

wait()

end

end